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#101422 Exam

Posted by Ron90 on 27 May 2008 - 09:34 PM in Biology

I found the M/C very good actually. The easiest out off all the past papers. Here are my answers (which i think i have gotten full marks) which have been cross-checked with another person, so there may be mistakes.

1. C 11. B 21. C
2. D 12. D 22. B
3. C 13. A 23. B
4. D 14. A 24. A
5. B 15. D 25. C
6. A 16. D
7. D 17. C
8. A 18. A
9. B 19. A
10. A 20. B



#101261 Exam 2008 Post Mortem

Posted by Ron90 on 20 May 2008 - 01:44 PM in Mathematics

Any chance of someone with paper 1 scanning it in?

BTW here is paper 2:

P.1
P.2
P.3



#101229 Good luck!

Posted by Ron90 on 19 May 2008 - 05:52 PM in Mathematics

QUOTE(spoony2oo8 @ May 19 2008, 05:06 PM) View Post
Yeah Good Luck

Let There Be As Little Log Questions As Possible


I hear that.



#101207 2007 Paper 1 Q9(a)

Posted by Ron90 on 19 May 2008 - 02:26 PM in Mathematics

f(x) = 3x - x^3

(a) Find the exact values where the graph of y = f(x) meets the x- and y-axes.

Ive found where it crosses the y-axis by making the x = 0 and got it as (0,0) which is correct.

However how do u find where it meets the x-axis? (apart from 0,0)




#101194 Logs

Posted by Ron90 on 18 May 2008 - 05:22 PM in Mathematics

I need a couple of things cleared up:

is 10^x the inverse of log(base10)x ?

is e^x the inverse of ln?

Is log(baseE) the same as ln?




#101143 2007 specamin non calc q4 multiple choice

Posted by Ron90 on 16 May 2008 - 04:08 PM in Mathematics

QUOTE(Marcus @ May 16 2008, 05:05 PM) View Post
is this the distance between two points question or am i looking at the wrong paper?



yeah. You find BA dont you then use the distance formula?



#101141 2006 paper II Q10(b)

Posted by Ron90 on 16 May 2008 - 04:02 PM in Mathematics

QUOTE(Marcus @ May 16 2008, 04:59 PM) View Post
\cos{x} and \cos^{-1}{x} are inverse functions of each other, ie

y = \cos{x} can be changed to x = \cos^{-1}{y} and vice versa
you started with
25\cos(x-1.29)=1

divide through by 25
\cos(x-1.29)=\frac{1}{25}

take inverse cosines of both sides ie, use the rule above
x-1.29=\cos^{-1}(\frac{1}{25})

then move the 1.29 to the other side
x=\cos^{-1}(\frac{1}{25})+1.29

hope this helps biggrin.gif



Brilliant. Get it now thanks smile.gif



#101139 2007 specamin non calc q4 multiple choice

Posted by Ron90 on 16 May 2008 - 03:57 PM in Mathematics

Well ive got the downloaded version off the SQA website and it gives the answer as C.

Ive done it as well and I got C.

So I guess your answer book is wrong.



#101138 2006 paper II Q10(b)

Posted by Ron90 on 16 May 2008 - 03:50 PM in Mathematics

Im stuck on this question.

Ive looked at a solution to it and it goes like this:

25cos(x-1.29) = 1

then to

x = cos^-1\frac{1}{25} + 1.29

im confused how this is done. Any help?



#100700 More Help

Posted by Ron90 on 21 January 2008 - 08:32 PM in Mathematics

QUOTE(Marcus @ Jan 21 2008, 08:06 PM) View Post
hmmmm, I got both 50 and 10, is there something in the question that ruled out 10?, and I think you ruled out the one >120 too early, make sure you don't ignore answers that are out of range until the very end, they may end up coming back into range wink.gif



Ok what you have is right, the graph shows it hits 0 twice before 60 and so that P points to the second one so that makes sense. Thanks! smile.gif



#100698 More Help

Posted by Ron90 on 21 January 2008 - 08:00 PM in Mathematics

QUOTE(Marcus @ Jan 21 2008, 07:55 PM) View Post
Are you sure you have the correct equation there...I'm getting 2 answers blink.gif blink.gif



yea i got 2 too, but one is >120 so i crossed that one out.

But the one i had left was 10, and the answer is 50 unsure.gif



#100695 More Help

Posted by Ron90 on 21 January 2008 - 07:37 PM in Mathematics

Yeah im again stuck at a question:

(b) Determine the exact value of the
x-coordinate of P, the point where
the graph intersects the x-axis


I have figured out the eq of function is: y = 2Sin(3x)-1 0<x<120



Any ideas? Thanks



#100685 Need Help with Question

Posted by Ron90 on 20 January 2008 - 02:01 AM in Mathematics

Thanks a lot, its a bit late for me to be thinking about maths right now, so ill try it in the morning smile.gif



#100681 Need Help with Question

Posted by Ron90 on 19 January 2008 - 04:55 PM in Mathematics

I'm also having problems with this Question:


11. (a) Express f(x) = (sq root)3 cos x + sin x in the form kcos (x a), where k > 0 and
0 < a < pi/2

(b) Hence or otherwise sketch the graph of y = f(x) in the interval 0 ≤ x ≤ 2pi



Thanks again.



#100680 Need Help with Question

Posted by Ron90 on 19 January 2008 - 04:16 PM in Mathematics

Seems a really simple question, but I can's seem to be able to work it out:


A function f is defined by the formula f(x) = 3x x3.

Find the exact values where the graph of y = f(x) meets the x- and y-axes


Thanks in advance